Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

34c9 a MDD full range speakers.
34c9 a MDD full range speakers.
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 18th September 2019, 04:37 PM   #51
pelanj is offline pelanj  Czech Republic
diyAudio Member
 
Join Date: Jul 2008
The principle looks similar, indeed.
  Reply With Quote
Old 18th September 2019, 07:06 PM   #52
claudiogan is offline claudiogan  Italy
diyAudio Member
 
claudiogan's Avatar
 
Join Date: Apr 2011
Location: Sassari
Quote:
Originally Posted by xann View Post
Hi.

I found it interesting that you know what the Juan Portela did in Santiago de Compostela, in Galicia, is the speaker they called "organ sound" and that has many similarities with the Mr. Gandolfi's MDD, but this in the late 60s.

The Organsound – https://medium.com/@tek_fest_86155/o...o-444956c91ab7 | Portela Seijo

Organ Sound: Los creadores del extrano altavoz hecho en Galicia que le flipa a Micah P. Hinson | Tentaciones | EL PAIS

Organsound by Espadaysantacruz

YouTube

Greetings.
Hi xann
your report is very interesting. The points in common with organsoud could be many. The vertical tubes are suitable for emitting delayed and coherent sound waves by diffraction. The base probably contains a two-way from which the tubes radiate, almost certainly with lengths in logarithmic series, as in the organs. It can be an inspiration for those who want to make high-powered speakers with drivers from 6" to 15".

Listening impressions are also suited to MDD technology. In the YouTube movie (with the limits of the quality of the recording) I perceive a familiar air in the sounds reproduced with the 54m42 speakers.

If it has been patented, it should be possible to recover the drawings of the internal structure. I'm curious to see the contents of the base. Unfortunately (fortunately?) I only see it today. It is strange that during my patent practice I was never notified. The practice has lasted years and is now abandoned. I probably would have saved time and money, but I wouldn't have gone into the mechanisms of MDD technology. Now I could not build excellent loudspeakers with a few tens of euros (66c9, 54m42).

Last edited by claudiogan; 18th September 2019 at 07:15 PM. Reason: integration
  Reply With Quote
Old 22nd September 2019, 07:14 PM   #53
pelanj is offline pelanj  Czech Republic
diyAudio Member
 
Join Date: Jul 2008
Here are the tube holders after vinyl self adhesive wallpaper application. Also, the painted bases. I will glue some foam to the bottom not to damage flooring. The L piece will be screwed to the small 19 mm riser to have more clearance for the magnet. Now I need to glue the tubes together and polish them. Then all will be mounted together for listening.
Attached Images
File Type: jpeg CCDBD99F-39C7-4CFE-A831-13DC2D4D9039.jpeg (580.5 KB, 166 views)
File Type: jpg 2EB36E16-7896-4218-A913-AAC914E75A65.jpg (438.8 KB, 156 views)
  Reply With Quote
Old 22nd September 2019, 07:42 PM   #54
claudiogan is offline claudiogan  Italy
diyAudio Member
 
claudiogan's Avatar
 
Join Date: Apr 2011
Location: Sassari
Quote:
Originally Posted by pelanj View Post
Here are the tube holders after vinyl self adhesive wallpaper application. Also, the painted bases. I will glue some foam to the bottom not to damage flooring. The L piece will be screwed to the small 19 mm riser to have more clearance for the magnet. Now I need to glue the tubes together and polish them. Then all will be mounted together for listening.
Hi Pelanj
you know how to work wood better than me. While waiting for the test with the complete system a suggestion for photos, the tubes seem much larger than the actual dimensions. Perhaps there would be a better perception of size with a common object nearby: a coin, a can, a CD ...

Last edited by claudiogan; 22nd September 2019 at 07:48 PM.
  Reply With Quote
Old 22nd September 2019, 08:11 PM   #55
pelanj is offline pelanj  Czech Republic
diyAudio Member
 
Join Date: Jul 2008
A good point. The bases are 195 x 300 mm and the holders 200 x 96 x 96 mm.
  Reply With Quote
Old 29th September 2019, 09:56 PM   #56
pelanj is offline pelanj  Czech Republic
diyAudio Member
 
Join Date: Jul 2008
Finally, the speakers are now finished - almost. I just need to mount some permanent connectors, now there are just wires directly to the speaker terminals. The former nickname, Kaťuša, does not fit anymore, since I chose the spiral form, now they look more like a pair of skyscrapers - so I need to find another one. In the photos, I actually noticed I have swapped the left and right side. I will start a build thread with more details and pictures.

The funny thing is, my wife asked me where I wanted to place these and insisted on the living room But there I plan the higher 3D printed version, since it looks even better.

I wonder if this principle would work with compression drivers to have a higher efficiency two way speaker with 12" or 15" bass. I definitely need to try a Karlson and a K-tube, but that is a different project.

All in all, I highly recommend building an MDD speaker, the price/performance ratio is just great.
Attached Images
File Type: jpg 19BF4138-84B3-4A2C-A193-466A6391CF97.jpg (993.2 KB, 125 views)
File Type: jpg 7F452574-F544-4FFC-BC06-D99FEDA1EBB6.jpg (990.5 KB, 126 views)
File Type: jpg 0C6B7DA7-BAB4-4EBB-8F67-7EB2A3903DC2.jpg (1,010.6 KB, 123 views)
  Reply With Quote
Old 30th September 2019, 08:26 PM   #57
claudiogan is offline claudiogan  Italy
diyAudio Member
 
claudiogan's Avatar
 
Join Date: Apr 2011
Location: Sassari
Quote:
Originally Posted by pelanj View Post
Finally, the speakers are now finished - almost. I just need to mount some permanent connectors, now there are just wires directly to the speaker terminals. The former nickname, Kaťuša, does not fit anymore, since I chose the spiral form, now they look more like a pair of skyscrapers - so I need to find another one. In the photos, I actually noticed I have swapped the left and right side. I will start a build thread with more details and pictures.

The funny thing is, my wife asked me where I wanted to place these and insisted on the living room But there I plan the higher 3D printed version, since it looks even better.

I wonder if this principle would work with compression drivers to have a higher efficiency two way speaker with 12" or 15" bass. I definitely need to try a Karlson and a K-tube, but that is a different project.

All in all, I highly recommend building an MDD speaker, the price/performance ratio is just great.
Hi Pelanj
you won the race for the first complete replica of an MDD sound box. It makes a certain impact to see a copy made abroad by a person I've never met. Internet is convenient in these cases.

In the 3d version proposed by elleman the effect of the unique 700 mm section used in the 439h project with the material other than wood and the radial wave guides is to be verified. I can't do tests with this configuration, now I'm always testing waveguides side by side starting from 5-10 mm above the speaker cone in different materials and with different shapes.

From the DIY (for the moment only pelanj can answer) I would like an opinion on my suggestion to pass one of the wires connecting the loudspeaker behind a radius of the basket. Do you perceive the difference or is it my self-conviction? In theory, you should never place ferromagnetic material inside a circuit with an audio signal.

In the Karlson and K-tube projects the effects of delayed diffraction are certainly important, for the moment I have never listened to them, I do not express opinions.

The 34c9 project has a very good price / performance ratio, but surprising results can be obtained even with materials other than aluminum such as: 66c9 paper, 54m42 alveolar polypropylene and more under test. In some cases the weight / performance ratio is exceptional.
Attached Images
File Type: jpg 3fe25 01.jpg (93.1 KB, 45 views)
File Type: jpg 3fe25 02.jpg (105.1 KB, 17 views)
File Type: jpg 3fe25 03.jpg (104.7 KB, 17 views)

Last edited by claudiogan; 30th September 2019 at 08:30 PM.
  Reply With Quote
Old 14th October 2019, 07:35 AM   #58
claudiogan is offline claudiogan  Italy
diyAudio Member
 
claudiogan's Avatar
 
Join Date: Apr 2011
Location: Sassari
Default 34c9 upgrade

Hello to all
an update on the construction of the 34c9 speakers.

I added a 4 mm thick poplar plywood flange between the loudspeaker and the wooden support. This change eliminates the sealant and simplifies the mounting and dismounting of the speaker. All wooden parts were colored in black.

There are no variations in the quality of reproduction.

It should be noted that I used 3FE25 new speakers, in the first few minutes of listening the sound was very closed with too much bass and reduced highs.

link. 34c9
Attached Images
File Type: jpg 34c9b 101 flangia.jpg (256.4 KB, 30 views)
File Type: jpg 34c9b 106 supporto.jpg (208.9 KB, 34 views)
File Type: jpg 34c9b 118 basso.jpg (163.5 KB, 35 views)
  Reply With Quote
Old 14th October 2019, 10:04 AM   #59
pelanj is offline pelanj  Czech Republic
diyAudio Member
 
Join Date: Jul 2008
Nice. I need to sit down and describe my build with a lot of pictures (that I need to take yet) - as I wrote above, I made some little changes to the mechanical arrangement.
  Reply With Quote
Old Yesterday, 04:18 AM   #60
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Location: Waterloo, ON or Herefordshire UK
34c9 a MDD full range speakers.
fantastic thread, the true spirit of diy
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote

Reply


34c9 a MDD full range speakers.Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
50% off full range speakers dave 111 Swap Meet 3 3rd January 2016 02:11 AM
Are these full range speakers? perceval Full Range 4 30th November 2015 12:22 PM
F5 with full-range speakers? majerjack Pass Labs 11 14th July 2012 11:26 AM
Frequency range of the human voice & full range center channel speakers jwmbro Multi-Way 31 20th January 2008 03:07 PM


New To Site? Need Help?

All times are GMT. The time now is 05:27 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki